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1da177e4 LT |
1 | /* |
2 | * acpi_container.c - ACPI Generic Container Driver | |
3 | * ($Revision: ) | |
4 | * | |
5 | * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com) | |
6 | * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com) | |
7 | * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com) | |
8 | * Copyright (C) 2004 Intel Corp. | |
9 | * Copyright (C) 2004 FUJITSU LIMITED | |
10 | * | |
11 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or (at | |
16 | * your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, but | |
19 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
21 | * General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License along | |
24 | * with this program; if not, write to the Free Software Foundation, Inc., | |
25 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
26 | * | |
27 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
28 | */ | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/types.h> | |
33 | #include <linux/acpi.h> | |
34 | #include <acpi/acpi_bus.h> | |
35 | #include <acpi/acpi_drivers.h> | |
36 | #include <acpi/container.h> | |
37 | ||
1da177e4 LT |
38 | #define ACPI_CONTAINER_DEVICE_NAME "ACPI container device" |
39 | #define ACPI_CONTAINER_CLASS "container" | |
40 | ||
41 | #define INSTALL_NOTIFY_HANDLER 1 | |
42 | #define UNINSTALL_NOTIFY_HANDLER 2 | |
43 | ||
44 | #define ACPI_CONTAINER_COMPONENT 0x01000000 | |
45 | #define _COMPONENT ACPI_CONTAINER_COMPONENT | |
f52fd66d | 46 | ACPI_MODULE_NAME("container"); |
1da177e4 | 47 | |
f52fd66d | 48 | MODULE_AUTHOR("Anil S Keshavamurthy"); |
7cda93e0 | 49 | MODULE_DESCRIPTION("ACPI container driver"); |
1da177e4 LT |
50 | MODULE_LICENSE("GPL"); |
51 | ||
1da177e4 LT |
52 | static int acpi_container_add(struct acpi_device *device); |
53 | static int acpi_container_remove(struct acpi_device *device, int type); | |
54 | ||
1ba90e3a TR |
55 | static const struct acpi_device_id container_device_ids[] = { |
56 | {"ACPI0004", 0}, | |
57 | {"PNP0A05", 0}, | |
58 | {"PNP0A06", 0}, | |
59 | {"", 0}, | |
60 | }; | |
61 | MODULE_DEVICE_TABLE(acpi, container_device_ids); | |
62 | ||
1da177e4 | 63 | static struct acpi_driver acpi_container_driver = { |
c2b6705b | 64 | .name = "container", |
4be44fcd | 65 | .class = ACPI_CONTAINER_CLASS, |
1ba90e3a | 66 | .ids = container_device_ids, |
4be44fcd LB |
67 | .ops = { |
68 | .add = acpi_container_add, | |
69 | .remove = acpi_container_remove, | |
70 | }, | |
1da177e4 LT |
71 | }; |
72 | ||
1da177e4 LT |
73 | /*******************************************************************/ |
74 | ||
4be44fcd | 75 | static int is_device_present(acpi_handle handle) |
1da177e4 | 76 | { |
4be44fcd LB |
77 | acpi_handle temp; |
78 | acpi_status status; | |
79 | unsigned long sta; | |
1da177e4 | 80 | |
1da177e4 LT |
81 | |
82 | status = acpi_get_handle(handle, "_STA", &temp); | |
83 | if (ACPI_FAILURE(status)) | |
a0bd4ac4 | 84 | return 1; /* _STA not found, assume device present */ |
1da177e4 LT |
85 | |
86 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
87 | if (ACPI_FAILURE(status)) | |
d550d98d | 88 | return 0; /* Firmware error */ |
1da177e4 | 89 | |
a0bd4ac4 | 90 | return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT); |
1da177e4 LT |
91 | } |
92 | ||
93 | /*******************************************************************/ | |
4be44fcd | 94 | static int acpi_container_add(struct acpi_device *device) |
1da177e4 LT |
95 | { |
96 | struct acpi_container *container; | |
97 | ||
1da177e4 LT |
98 | |
99 | if (!device) { | |
6468463a | 100 | printk(KERN_ERR PREFIX "device is NULL\n"); |
d550d98d | 101 | return -EINVAL; |
1da177e4 LT |
102 | } |
103 | ||
36bcbec7 | 104 | container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL); |
4be44fcd | 105 | if (!container) |
d550d98d | 106 | return -ENOMEM; |
4be44fcd | 107 | |
1da177e4 LT |
108 | container->handle = device->handle; |
109 | strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); | |
110 | strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); | |
111 | acpi_driver_data(device) = container; | |
112 | ||
4be44fcd LB |
113 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", |
114 | acpi_device_name(device), acpi_device_bid(device))); | |
1da177e4 | 115 | |
d550d98d | 116 | return 0; |
1da177e4 LT |
117 | } |
118 | ||
4be44fcd | 119 | static int acpi_container_remove(struct acpi_device *device, int type) |
1da177e4 | 120 | { |
4be44fcd LB |
121 | acpi_status status = AE_OK; |
122 | struct acpi_container *pc = NULL; | |
1da177e4 | 123 | |
50dd0969 | 124 | pc = acpi_driver_data(device); |
6044ec88 | 125 | kfree(pc); |
1da177e4 LT |
126 | return status; |
127 | } | |
128 | ||
4be44fcd | 129 | static int container_device_add(struct acpi_device **device, acpi_handle handle) |
1da177e4 LT |
130 | { |
131 | acpi_handle phandle; | |
132 | struct acpi_device *pdev; | |
133 | int result; | |
134 | ||
1da177e4 LT |
135 | |
136 | if (acpi_get_parent(handle, &phandle)) { | |
d550d98d | 137 | return -ENODEV; |
1da177e4 LT |
138 | } |
139 | ||
140 | if (acpi_bus_get_device(phandle, &pdev)) { | |
d550d98d | 141 | return -ENODEV; |
1da177e4 LT |
142 | } |
143 | ||
144 | if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { | |
d550d98d | 145 | return -ENODEV; |
1da177e4 LT |
146 | } |
147 | ||
3fb02738 | 148 | result = acpi_bus_start(*device); |
1da177e4 | 149 | |
d550d98d | 150 | return result; |
1da177e4 LT |
151 | } |
152 | ||
4be44fcd | 153 | static void container_notify_cb(acpi_handle handle, u32 type, void *context) |
1da177e4 | 154 | { |
4be44fcd | 155 | struct acpi_device *device = NULL; |
1da177e4 LT |
156 | int result; |
157 | int present; | |
158 | acpi_status status; | |
159 | ||
1da177e4 LT |
160 | |
161 | present = is_device_present(handle); | |
4be44fcd | 162 | |
1da177e4 LT |
163 | switch (type) { |
164 | case ACPI_NOTIFY_BUS_CHECK: | |
165 | /* Fall through */ | |
166 | case ACPI_NOTIFY_DEVICE_CHECK: | |
167 | printk("Container driver received %s event\n", | |
4be44fcd LB |
168 | (type == ACPI_NOTIFY_BUS_CHECK) ? |
169 | "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); | |
1da177e4 LT |
170 | status = acpi_bus_get_device(handle, &device); |
171 | if (present) { | |
172 | if (ACPI_FAILURE(status) || !device) { | |
173 | result = container_device_add(&device, handle); | |
174 | if (!result) | |
f883d9db | 175 | kobject_uevent(&device->dev.kobj, |
312c004d | 176 | KOBJ_ONLINE); |
1da177e4 LT |
177 | else |
178 | printk("Failed to add container\n"); | |
179 | } | |
180 | } else { | |
181 | if (ACPI_SUCCESS(status)) { | |
182 | /* device exist and this is a remove request */ | |
f883d9db | 183 | kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); |
1da177e4 LT |
184 | } |
185 | } | |
186 | break; | |
187 | case ACPI_NOTIFY_EJECT_REQUEST: | |
188 | if (!acpi_bus_get_device(handle, &device) && device) { | |
f883d9db | 189 | kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); |
1da177e4 LT |
190 | } |
191 | break; | |
192 | default: | |
193 | break; | |
194 | } | |
d550d98d | 195 | return; |
1da177e4 LT |
196 | } |
197 | ||
198 | static acpi_status | |
199 | container_walk_namespace_cb(acpi_handle handle, | |
4be44fcd | 200 | u32 lvl, void *context, void **rv) |
1da177e4 | 201 | { |
4be44fcd LB |
202 | char *hid = NULL; |
203 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
204 | struct acpi_device_info *info; | |
205 | acpi_status status; | |
206 | int *action = context; | |
1da177e4 | 207 | |
1da177e4 LT |
208 | |
209 | status = acpi_get_object_info(handle, &buffer); | |
210 | if (ACPI_FAILURE(status) || !buffer.pointer) { | |
d550d98d | 211 | return AE_OK; |
1da177e4 LT |
212 | } |
213 | ||
214 | info = buffer.pointer; | |
215 | if (info->valid & ACPI_VALID_HID) | |
216 | hid = info->hardware_id.value; | |
217 | ||
218 | if (hid == NULL) { | |
219 | goto end; | |
220 | } | |
221 | ||
222 | if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && | |
4be44fcd | 223 | strcmp(hid, "PNP0A06")) { |
1da177e4 LT |
224 | goto end; |
225 | } | |
226 | ||
4be44fcd | 227 | switch (*action) { |
1da177e4 LT |
228 | case INSTALL_NOTIFY_HANDLER: |
229 | acpi_install_notify_handler(handle, | |
4be44fcd LB |
230 | ACPI_SYSTEM_NOTIFY, |
231 | container_notify_cb, NULL); | |
1da177e4 LT |
232 | break; |
233 | case UNINSTALL_NOTIFY_HANDLER: | |
234 | acpi_remove_notify_handler(handle, | |
4be44fcd LB |
235 | ACPI_SYSTEM_NOTIFY, |
236 | container_notify_cb); | |
1da177e4 LT |
237 | break; |
238 | default: | |
239 | break; | |
240 | } | |
241 | ||
4be44fcd | 242 | end: |
02438d87 | 243 | kfree(buffer.pointer); |
1da177e4 | 244 | |
d550d98d | 245 | return AE_OK; |
1da177e4 LT |
246 | } |
247 | ||
4be44fcd | 248 | static int __init acpi_container_init(void) |
1da177e4 | 249 | { |
4be44fcd LB |
250 | int result = 0; |
251 | int action = INSTALL_NOTIFY_HANDLER; | |
1da177e4 LT |
252 | |
253 | result = acpi_bus_register_driver(&acpi_container_driver); | |
254 | if (result < 0) { | |
4be44fcd | 255 | return (result); |
1da177e4 LT |
256 | } |
257 | ||
258 | /* register notify handler to every container device */ | |
259 | acpi_walk_namespace(ACPI_TYPE_DEVICE, | |
4be44fcd LB |
260 | ACPI_ROOT_OBJECT, |
261 | ACPI_UINT32_MAX, | |
262 | container_walk_namespace_cb, &action, NULL); | |
1da177e4 | 263 | |
4be44fcd | 264 | return (0); |
1da177e4 LT |
265 | } |
266 | ||
4be44fcd | 267 | static void __exit acpi_container_exit(void) |
1da177e4 | 268 | { |
4be44fcd | 269 | int action = UNINSTALL_NOTIFY_HANDLER; |
1da177e4 | 270 | |
1da177e4 LT |
271 | |
272 | acpi_walk_namespace(ACPI_TYPE_DEVICE, | |
4be44fcd LB |
273 | ACPI_ROOT_OBJECT, |
274 | ACPI_UINT32_MAX, | |
275 | container_walk_namespace_cb, &action, NULL); | |
1da177e4 LT |
276 | |
277 | acpi_bus_unregister_driver(&acpi_container_driver); | |
278 | ||
d550d98d | 279 | return; |
1da177e4 LT |
280 | } |
281 | ||
282 | module_init(acpi_container_init); | |
283 | module_exit(acpi_container_exit); |